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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a80d60db6f5302d875b69aec243a9e4b0d4c1b95d2cd7957683ef16a5a48a1' 
  AND token = 'H4UVuoMlw+EPT4gMBnOoSb29vEMVeSrmLakfZI44r4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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