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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1d9ffead7f3bd8d67311a896a2a2e562ca3cef98058a042caf40363e5c415c' 
  AND token = 'lNygZevc0P/aUUdE0FLxDIeBBqj1OCPgIzcb5SE/YTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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