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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99469e15fa0dcc2364d6fd6e54a57f5a5a73b25f7324175915287c3200dcf150' 
  AND token = 'c6jYsZOK1JXFZKRLsHboHac6I7aE1RN/jiD8xJcudLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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