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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02243cb0eb267ef8e74a76a61be8d7da024aed8fd0eef90993e205938db921dd' 
  AND token = 'ad29TranZ5AkRPAml+SIWInwU8NQ7rEVJpKT0T/Nb9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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