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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae5aa4dfddd20930c83137ce1d617456919f6bdcd47ff7ead0c49a15baf0b5f' 
  AND token = '66XjYca01PrzOB7gFd3jaGQ/56panjiSLJessvBxLYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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