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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a3fc62eada25516ef32c6e4c8d7ff1fd7bef8dac67ff0f13c567302750374d6' 
  AND token = 'BYyjHlG+nhJxXF4opTKCXuOrPFbd7DHaYl60LQGhiiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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