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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc5de56489d8a8739eb0db7b39c2964e60f864086d018ed388c42e5958d46cd' 
  AND token = 'aPAxTimE7bmvaCgSgyKM3DqER2qV6WnHKoEUCixaTzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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