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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add07c8b1e2536daccf78f592d32040b9ecb0aef5c1b2fd836ae809383eae059' 
  AND token = 'x5IPwLIOZ7QVFXG6OysKBXe4b55HvkVLO5uG0deNm+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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