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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d575572e508989b05a58d370ad06a3f52c407add89a4da128bee577a9b4d77c' 
  AND token = 'UFkoZizSsAU0W2l9N54UkqHG5eUMwZEF/DzXq4VrJMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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