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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f3c0e760ffda5d4bc47d8b7a8d9660e48bc55d90cac49fc769eed47a90e038' 
  AND token = 'H5SJhgRF5W5rW1OHSZZLi6Kr7DfGUk7fV1fdqs/HVXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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