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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54a4adf30896318afa7398b7088707762cb8e9d29a14469e16a7cbba2035d9e' 
  AND token = 'SDm023To1G6x2EjlGjWlifTl1Y282aWtzSO9oz0GasQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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