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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc4d518fbe800513dae16e3920d1ee47cf1b47946140e280b73a098ea27a45c7' 
  AND token = 'A2sSeVHR+PIyWabAQve2kENR6CmhLuaemfbGOyH5jQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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