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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9903094e6f4f2458bf5b6ac2b4d3227c321dc2429fc451f1543cf59346d131' 
  AND token = 'EC0p4GQa2MC1itGhdbykF2EVEHwVK57M5SvB/R5e8e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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