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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ec74c9e113c46fe04f1a9e8cc5744c0b4095d82250652c015888f7efd2286e' 
  AND token = 'FDjbct0q0P3kww/BkxUpZGWVrrUdZP/RIbMW1Izky0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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