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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1460ee1170cb60960b16b4f2c56a7f655ebeb7f225a055418c0d0431fb683169' 
  AND token = 'd9vjpyiFj0bkzD7ta8HkRh4wQSZtiZDIzkwpobezonw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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