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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b2d41e1bb1c054cd57f3c3c16b340396983ced02f5109f8d42e7591b2cdb1c' 
  AND token = 'dgtYuxev28A8IWzDnXbwwUj6HiYHgYC5EcqGh/6dwdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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