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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a982950e07eebf2d35f279fc02cc4b893c29e582c26eb72e4f6795a9500173f5' 
  AND token = 'Zx7mSu1qKmNX61yV/swRTsXQmUtrKm+ML24h9uOuesQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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