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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee0c2032723a07f98bb9f1d17d57eb4efc61d0972529a0ce05f1324e5638d37' 
  AND token = 'JW6Xe0FQDlZwb5CrPXi1vD3TTCFjM1lGZCR9cDEYlrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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