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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9823a4538cf9b8804e2477adc92e7cc793eede7ddce5778e0ee125c17db85754' 
  AND token = 'uT8sgWs1/+Suaokz60fw8jMdJ1bGIm3MS15hODi1kYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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