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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c04362c641a2fb18ef1fe3eb22208187f7e98c34bf84b97c3f8b71fd80efe31' 
  AND token = 'BG2IswWM57kc8l9rfFDX90gtybmu8/sfPdzP5lQTdVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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