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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95067c1938ec1f2d3358173dda25accc626196f5ea6472ead740ebd4dc30d6c' 
  AND token = '62hTF/+6HJsaiZkb683ZeVbkh02stIbREBqaMGu/psQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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