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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ca287fbf4bce93329324194a26ce44240eee7dc310ccec383687dc60c4f56c' 
  AND token = '5RFv9BE78Y/h5vJ4ftRWkqh/6aMkVnv5iVDJl6YbhCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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