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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691dcd684aa45f8930f92a4bc4c3a5e30e506a587cd1891d9fb777ba52629d16' 
  AND token = 'xKCs7GbRb0bHA0WMHU5wuiy948sVqj6IY22yLYCxjGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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