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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bef099fac3c751ad6394b31be23525fb26c4255255ab12c0b641d0f046b4d265' 
  AND token = 'qu9YMbjDfix5aHSOdZzrkn6Dr8oWPD58KRXZ4nsoe0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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