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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98b625d92d86f9a47279ec7d718e3fb0f1acaf266d05a4a412b5bfd9724f6d2' 
  AND token = 'mfs3NmYcO69EmW36UHXY2YfBIwKLV3NCOpwCKxFerWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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