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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cd77e69a3488fa30791ebe41ef8cbbfc0fb2b396df229ba4369481edb17e033' 
  AND token = 'fTVo44TbES35GifH8r1OM59z8cgepJpnd84nQ9yPQ90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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