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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44035a6afa6245b2494e52dc748475d49a4b976290ce8169c3c7d36506e8967e' 
  AND token = 'jPS4FTGOlv15iRM4THgce3mq5R2zbt/IopWApFjGC+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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