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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4141f928f72cae0c46f959c0964949513d6b252cb7eb6d7e69c4300f4ee72cd' 
  AND token = '0nukWJ4fnvpYieAmXrCucQWr7TPzwpQ1b8lrg01j7e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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