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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38f8df9e219af9d815a1dde4199961a707713e67d005c3b3ae65b7d62325755' 
  AND token = 'xDibglKkBAADyL5rHZvsDNDnBhrTkVu/XHdgEbEB4go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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