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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3dfb722e6fe876138dca0923d43b6ce08c4ee2365909b11a6d38603873945c' 
  AND token = '16E90UkHzwJRGAaH6QgCDQ7dWbV3kU+AV+N29sRjRZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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