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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd420bd302fbd3c7b776a6f16a3bde9f0e37a1006340e55a3d4678abd8bc83586' 
  AND token = 'zo3XQx79UCIlFB77iRoBTHofRfKVTG0OBGjWuuY7DPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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