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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27822762f82ec55b0a8456ecc00a1c500189a5f8e9120a6be1947aef55771287' 
  AND token = '9d9Wazl8sVndYDEdi0kTiut1+R+iz9MMeDi5epcqNG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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