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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8584a52f4fe06ad7362c4fe57e65a7b2f72453a9e384a6ecd360a9bbc456b66b' 
  AND token = '2pYWmjM2duDCU5RbTBlodlFOh6jk9OenYzkm712FmLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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