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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16697d69980b58c45cb4f78bc8df121c4b960ea7a0a93510cd60671b286b9d53' 
  AND token = '6JzphUIMZ7UzkJg803Pq4csYiTCun42Aafjagpjn6Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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