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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e01b52e0a598ff3382a72a6a9d22095c4d722ae7aeed876707edb57a5f7628' 
  AND token = 'F4hvK1TajDZU7S/3bBTlBgei8rMNoOkSvg7WpqEacWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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