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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb92d1777f52f9d988dd4264abb74a7b67b1e5de9d4df95e86082092991ac4ee' 
  AND token = 'Le3xww5I7Ii9ZhsBBC8qnx/PE3d5i8wBuQfoKpedv+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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