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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dc7c5ce28fa303cf49467d525dc415119dc8b26422792989a6528a3a7d4928' 
  AND token = '3123uC4DEvdtv2UrtMnr2ddwCXK8p495UVHUK2AHB/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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