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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa5f670fd0aac1facf6ff74eb554d7ef48bbf364397eaa5d1bdd5363bea9c61' 
  AND token = 'WzuGfmN7RSd5FkECzSX0jNPwsUo8S1t/sWIwHebtCww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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