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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926e6e829c5909f7d8bc2d87a6c401116adb8d741dab4f93818c24a2d0d64711' 
  AND token = 'arWO425+QGSQdW4cOQpdtqpGvMUbrixj/UfsyszL90g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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