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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f50b24bc691608d141c5f9564c2dcc286332835e3e3e12630cfcb9e183cbcc0f' 
  AND token = 'oanUhj8e9wKaMlbcio8DYeDggMKAKZ0EYk7dK68wnCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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