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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cb30b0bcc026e241cab611beebf9fd44ea3987f92d28c58e6f9205015cd127' 
  AND token = 'AkkBdkST3usBdglkAz4bMXlFoQg61w1/buE10Y4n4iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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