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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e342236ba0c182e0f79dc9360e9b79f1a29faae215698e11f8491acd6945e09d' 
  AND token = 'XHudCV7mTC2OGpRbMu8mtmKXpcJGBbukPQeuz6SCDK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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