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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa992889966fb4283a0edf7b7de8ed1d8778f86148b41ff216efec8eccd003ee' 
  AND token = 'wpoGieZhN+Jh/kf5+yRUBH+GZEfnzrkw4WqU0npNqL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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