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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce4cc9f22b39802201abca9756b4147f2593c20ac225dbae47ad2b34f507de8' 
  AND token = 'kU4c8A8FDq9dZS8U7e9IkrpHytKEJN1zbO1gyc+wzTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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