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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3a39ea71ad7a0cbd7d653ce8804a5b0f789f1e6e256d6a2ef761d4c7cc2d84e' 
  AND token = 'yQg4B/2RSgN8Z9jDNtFi5Lk5F5fNgejf78tfmTlaj/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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