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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fac5ad91e13cf8172c80e2c5f858aaa6d90b5cf8038ade6ed13f9750a8c0a07' 
  AND token = 'EhunDfSWoWo5/kpU8CumLe7SitUUvj1WOdn7h6cjydQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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