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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77a55b8c0744f309bacc43ddc83963ef4d9e8297285871f768d6088feced78b' 
  AND token = 'pH27+Z7zo2pWINZxzbUwmC6W6lnJpOCx4EzZZJDYcTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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