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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfad14d551f226a76c87c93e295605c02548006ade20b9af0eddc8a45e0895ec' 
  AND token = 'I3sXttz42XNHqS75AIDrHaJpgi0q8QDY0sjxl/CmjuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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