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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d4444520401aa73368a913834e837376fee27fae171cf2362e29c2c8b04a19' 
  AND token = '3gAXDNXGBaIXt1m40zig5HcnSIqsABuhGw9OzpRz/MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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