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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb2cc2ce96210e8355c66ce6c7d9ed8b2e88de148cbd01e194228e7b6c3eda8' 
  AND token = 'm7Oe3pcuoIQ128DWCr2lBMHsOtv69DaZnuUzZmxtgCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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