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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e75aa56d8f811aed61c4ea4a5435b0fe01110f0e70b4c78e28bc4fa23d997bc' 
  AND token = '9bW3McphN9ywiCZLfa0KRFKroQeQfEDQHV+BHlOsGt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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