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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e76590c1a1cc224b7c4b033b8ef017c55d303d6d5444a66728d53bb6645148f0' 
  AND token = 'hJJY4NmqdkisPlzGjxT9vXddhW6yOVI5kY1n2xurPcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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