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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6059e99a8c25b95738d06d4765377967cb99788c763d562eab2fd0c96cc31d1' 
  AND token = 'nMI/BdJT5NerozKIJhujBbQ/ZfTbdNiK+mE9nwOddks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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