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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1d09cf418a97716f2e56826b123619b1623109a2168c8edd9107acbc0db9f5' 
  AND token = 'wwTyNKHQuX821c6QrT143iY3ZwCQmkxJqeXjx/eneHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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