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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d46a035e49fac2f76821e8bb79e8ddf0422a4806c92dc7ca334f81c0d9e91d3' 
  AND token = '8V7CfSaTBhvofGYLTVn2UxYsOiFC+MCTX9j80XwM9DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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