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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ad55d51978aba46a950ec4b31006122ac245254b73e9c8dd86a7a3bf738e00' 
  AND token = 'mIFqfD0ucZ6XxRyLGVRZvkM1bnMKE24GH8N/upmvGOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}