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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6629b0c15bbf467b100f98d99cfc2a5cd4f0d19e22b82fab0ebf7414e5e55ff7' 
  AND token = 'JBeebfBJ/mJfSz0vRt63h044tLWk2G8YtThfz47hhwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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