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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b176028482e822b3389110c680607681784747d7f814c9e57f8c718d25b751b' 
  AND token = '0bZHUn5HpRDpGp/tB5JDB9db8GYBVaPlbE3EJiNeDHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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