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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19e99e56f60d5f42e209382b17cce9460826d59478db3e19689899ab19945f5' 
  AND token = 'VCM5SjiYXP8sV54Ihjq6ueSCPHGicrQVosEZ8sQQ4Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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