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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75f27d97487f134a972d76d9382caf664fb3a73300bc6c9da06ae9378dfda96' 
  AND token = '5OyGkGj1ZJdIeFkYjGbZxfo7jYAUThllWt+Jk1S6l1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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