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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2319d842768ddc3de200452f7340bf9a4751fcdd8f43384121fd0c874b3b355a' 
  AND token = 'PBVa1OCu3YUAuXcFdwKk1DMx+LE0p6FOzfTOq/9I034=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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