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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e603425916fa600c48a6d86b9a73c91c88ac461cdcf8b4791f00a0600c93b6c2' 
  AND token = 'U7blNssSW+MJg2vVWei5xz82kieNhvcKZOgiFGtXBpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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