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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089ea830b9dc81d9dcf0cc552c5887a0e2d8282e008af5dc15b1bb00b6f3fbb8' 
  AND token = '3pCMSy/ICTOnEFQ1dc5oEWH/KuG+htdRQK4dX7En8Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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