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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885a27c98fbae6dc70ab0c625970e91baf47ace0ce5958ae5781a370b0aea5d7' 
  AND token = 's/VLp1yJ7xXQtxVPxaquvI8E2AM9A0WNX5X4Gm9FPh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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