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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8adad3dc26c05a1c7a6d62b2af003f840204e2bd87df871132817765393e08a' 
  AND token = 'rnAH6MpPPQYgVNe7TALacHyLyVGSZXl3YM6MqhWvQzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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