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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc2d1d6e5c378b8dfb620183f07da6caa877b23ad0cb5ade0e535aac3b43d8b' 
  AND token = 'x2xM9stv91zHgb3YFKTqj4DkhhyXRye4XUmJhHuTwBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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