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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbfeb2584700a5de629033e5cb49239178839e71dd0ca1ee6c7dca79cd1db39' 
  AND token = '5VSVQbdB/i0K/tfswb6OnW0FPxE1KXdN69joBp0LxZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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