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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba679e290468bc3439f0a914c84b96610b609a06fcfcd8d466c7f8d0167777a9' 
  AND token = '/D208fA/ZktKuMekvN4mafcSZhB7hHR4Blyh6lCwHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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